Hi, fmtlib supports using FMT_MODULE to make itself a c++ module, but the implementation is building manually rather than using native support from CMake. This leads to some problems. For example, we cannot add definitions like FMT_STATIC_THOUSANDS_SEPARATOR.
I saw previous discussion #3429 (comment) concerning native support from CMake is not yet ready. But now it has been stabilize: https://www.kitware.com/import-cmake-the-experiment-is-over. Maybe it's time to add the support?
I tried something like
add_library(fmt STATIC) target_sources(fmt PUBLIC FILE_SET CXX_MODULES FILES fmt/src/fmt.cc) target_include_directories(fmt PRIVATE fmt/include) target_compile_definitions(fmt PUBLIC FMT_USE_FLOAT=0 FMT_USE_DOUBLE=0 FMT_USE_LONG_DOUBLE=0 FMT_USE_FLOAT128=0 FMT_USE_LONG_DOUBLE=0)
and it does work! (though we cannot add FMT_STATIC_THOUSANDS_SEPARATOR unless we comment out chrono.h.)
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